Improvement in lock-up safety-valves



ATTORNEYS.

Patented May 4,1875.

E B KUNKLE Lock-Up Safty-Valve.

NI'IED SATES ATENT FFIC.

ERASTUS B. KUNKLE, OF FORT WAYNE, INDIANA, ASSIGNOR TO HIMSELF AND E.BOSTIGK, OF SAME PLACE.

IMPROVEMENT IN LOCK-UP SAFETY-VALVES.

Specification forming part of Letters Patent No.- 162,83 1, dated May 4,1875; application filed November 14 1874.

State of Indiana, have invented a new and Improved Lock-Up Safety-Valve,of which the following is a specification:

My invention is an improvement in the class of safety-valves which areconstructed with an annular chamber in the under side of a flange formedon the head thereof, the same being generally held to their seats by arod or stem, which entersa central recess in the upper side of thevalve.

The improvement relates to the construction and arrangement ofparts,whereby economy of space is attained, and the sealedpressure-adjusting screw protected, as hereinafter described.

The adjusting-screw for regulating the tension of the spring is adaptedfor and provided with a split-wrench, with taper adjusting screw and nutfor turning it.

Figure l is a sectional elevation of the improved lock-up safety-valve.Fig. 2 is partly a top view and partly a horizontal section. Fig. 3 is adetail in section, showing a modified form of the valve and its seat.Fig. 4 is a detail in top view, showing the seal applied for guardingthe adjusting-screw of the spring. Fig. 5 is a plan of a cap forinelosing the top of the adjusting-screw. Fig. 6 is partly a sideelevation and partly a sectional elevation of the wrench for turning theadjusting-screw, and Fig. 7 is an end elevation of the wrench.

Similar letters of reference indicate correspondin g parts.

A is the steam-pipe, which is connected to the boiler or to another pipeat B. (J is the cap to this pipe, for inclosing the valve. It has aflange, D, extending down the side of the pipe, and looking to it by theribs E on the pipe and the grooves in. the flange. It is also fastenedagainst turning after being adjusted by a set-screw, F. There is anannular escape-passage, G, through the top of the cap next to the flangeO. H is the valve. It has a deep chamber, I, in the upper side, in whichis the pressure-spring, J, for holding it closed, the spring beingarranged between the b plates K and L, and confined against the bottomof the chamber by the adjusting-screw M in the cap. N are the channelsin the valveseat, to receive steam when the valve opens to amplify thelifting force on the valve, and insure the holding of it open until thepressure falls somewhat. The seat is thus divided into two parts, one ofwhich may receive the valve into it a little, as at Q, or it may receiveit on the surface, as at R. The former arrangement will probably be mosteflicient in retaining the steam in the chambers to increase the lift,but both will act in the same manner to a certain extent. Theadjusting-screw M screws down into a socket, S, to be covered by a cap,T, and to guard against improperly changing it by unauthorized persons aseal, consisting of a lead disk, 0;, is put on and fastened by pressingsome parts into holes or recesses in the top of the screw, so as to holdit on temporarily to prevent the application of a wrench for turning it.The wrench consists of the taper split socket-key V and nut 'W, thesocket being made round and ribbed inside to fit grooves to be made inthe head of the screw, to prevent the wrench from slipping round. Thisform is also difficult to imitate by false keys, but other forms may beused. The valve has wings X to keep it in proper position in thesteam-pipe.

Having th us described my invention, I claim as new and desire to secureby Letters Patcut-- 1. The cup or chambered valve H, the spiral springJ, and disks K L, respectively provided with a point and recess, andarranged within the valve, the pointed pressure-adjusting screw M, andthe steam'pipe or casing A, having cap 0, all combined as shown anddescribed.

2. In asafety-valve, the combination of the steam-pipe cap 0, having asocket, S, and screw-cap T with the sealed pressure screw M, to permitthe latter to be turned by a wrench, substantially as herein described.

EBASTUS B. KUNKLE. Witnesses:

E. N. THOMAS,

HENRY ZIMERMAN,

